Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or living in the depths of the ocean, especially between about 1,000 and 4,000 meters (3,280 and 13,120 feet).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or pertaining to the parts of the oceans at depths between 1000 and 4000 meters deep.

from The Century Dictionary and Cyclopedia

  • Swimming or floating both at the surface of the sea and in its depths; pelagic.

Etymologies

bathy- +‎ pelagic (Wiktionary)

Examples

  • It's believed to be a scavenger that feeds upon dead whales and squid in the pitch black darkness of the bathypelagic zone, some 2140m/7020ft below the water surface. giant ispods went on display at the Sea Life Centre at Blackpool for the first time in Britain last year.

    Practical Fishkeeping

  • Instead, trapped in the deep, the oil fouls the ocean's twilight and dark zones: the mesopelagic and the bathypelagic (bathos: deep).

    MotherJones.com

  • Instead, trapped in the deep, the oil fouls the ocean's twilight and dark zones: the mesopelagic and the bathypelagic

    TreeHugger

  • The resulting environmental effects on [[benthic]] life forms of the [[bathypelagic]],

    Citizendium, the Citizens' Compendium - Recent changes [en]

  • Oceanographers divide the ocean into five broad zones according to how far down sunlight penetrates: the epipelagic, or sunlit, zone: the top layer of the ocean where enough sunlight penetrates for plants to carry on photosynthesis. the mesopelagic, or twilight, zone: a dim zone where some light penetrates, but not enough for plants to grow. the bathypelagic, or midnight, zone: the deep ocean layer where no light penetrates. the abyssal zone: the pitch-black bottom layer of the ocean; the water here is almost freezing and its pressure is immense. the hadal zone: the waters found in the ocean's deepest trenches.

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  • Oceans  Shallow ocean waters (euphotic zone) contain a greater concentration of organisms than the rest of the sea  Phytoplankton (algae) is food not only for zooplankton (protozoans and microscopic animals) but also for small fishes  Coral reefs - areas of biological abundance just below the surface in shallow, warm, tropical waters  Chief constituents are stony corals, animals that have a calcium carbonate (limestone) exoskeleton, and calcareous red and green algae  Most of the ocean lies within the pelagic zone  Epipelagic zone lacks the inorganic nutrients of shallow waters, and therefore it does not have as high a concentration of phytoplankton  Animals in the deeper waters of the mesopelagic zone are carnivores, which are adapted to the absence of light,  Waters of the bathypelagic zone are in complete darkness except for an occasional flash of bioluminescent light  Abyssal plain - many invertebrates survive there by feeding on debris floating down from the mesopelagic zone

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